Drill guide



B. R. HEIL DRILL GUIDE Jan. 13, 1953 2 SHEETS-SHEET 1 Filed Sept. 1,1948 Inventor BernardE/Zez'l Attorney Patented Jan. 13, 1953 Ui'iEDSTATES ATENT OFFICE DRILL GUIDE Bernard R. Heil, Los Angeles, Calif.Application September 1, 1948, Serial No. 47,229

1 Claim. 1

The present invention relates to drill guides and it consists in thecombinations, constructions and arrangements of parts herein describedand claimed.

It is an object of the present invention to provide a drill guideparticularly adapted for use with plate nuts such as are at presentutilized in aeronautical construction for the purpose of preventingscrews from becoming loose due to the excessive vibration.

Another object of the invention is the provision of a drill guide whichmay be quickly and easily attached to a portable drill.

Another object of the invention is the provision of a device of thecharacter described which is simple in construction and operation andyet effective and efficient in use.

A further object of the invention is the provision in a device of thecharacter set forth of novel means for guiding and holding a drill intoproper position.

Other and further objects of the invention will become apparent from areading of the following specification taken in conjunction with thedrawings, in which:

Figure 1 is a side elevational view of an embodiment of the invention,

Figure 2 is a sectional view taken along line 2-2 of Figure 1,

Figure 3 is a sectional View taken along line 3--3 of Figure 1,

Figure 4 is a vertical sectional view of the device forming the presentinvention, in position upon a portable drill which is shown inelevation,

Figure 5 is an elevational view taken at right angles to Figure 1,

Figure 6 is a bottom plan view taken along line 6-45 in the direction ofthe arrows, and

Figure 7 is a perspective view of an element of the invention.

Generally, there is provided a drill guide which is quickly and easilyattachable to a portable drill by means of a simple socket and clamparrangement in which the drill chuck is positioned and which hasattached thereto a telescoping cylindrical member having a removablyattached base plate of identical contour to the so-called plate nut andprovided with a centrally disposed guide pin adapted to fit within thepilot hole of the plate nut and an eccentrically mounted spring-presseddetent which is adapted to be positioned in the first hole drilled inthe plate nut whereby to act as a guide for the proper drilling of thesecond hole therein. The base plates and their attendant structures areinterchangeable for use with varying sizes of plate nuts.

Referring more particularly to the drawings, there is shown therein aportable drill Ill having an operating handle I! and a shaft casing l2at the end of which is a conventional chuck I3. Drill bits I4 of varioussizes and conventional structure are mounted in the chuck l3.

The present attachment consists of a socket l5 which encompasses thecasing l2 and which is provided with a longitudinal slot l6 having apair of outwardly extending ears l1 adjacent thereto and which ears areinterconnected by means of a bolt l8 and nut l9.

Integrally formed with the socket I5 is a cylindrical portion 2a whichis slidably mounted within a cylindrically shaped connector element 2|having an annular lip 22 at its inner end. A retainer ring 23 isthreadably mounted upon the outer side of the portion 20 adjacent thesocket l5 and a compression spring 24 surrounds the member 20 and thelip 22.

A base plate 25 is provided with an integrally formed circularprojection '26 which is threadably connected interiorly of the outer endof the member 2|.

Centrally disposed with respect to the projection 26 is an opening 21 inthe plate 25. The plate is provided with a centrally disposed guide pin28 and a detent 29 is slidably mounted in an opening 30 in the plate 25and in a position in said plate corresponding with but diametricallyopposed to the opening 2'! therein. The detent 29 is held in position bymeans of a spring 3|.

The plate nut is best illustrated in Figure 4 of the drawings andconsists of a plate 32 having a pair of diametrically opposed integrallyformed wings 33 and 34 and an integrally formed projection 35 having acentrally disposed threaded opening 36 therein. A cap 31 having acentrally disposed opening 38 is threadably mounted upon the projection35 and a fiber washer 39 is held between the outer end of the projection35 and the cap 31.

In operation, it will be seen that the socket l5 may be placed over thehousing I2 and locked in position thereon by means of the bolt l8 andnut I9 and that the base plate 25 may then be positioned upon the platenut of identical size and shape in such manner that the guide pin 28lies in the opening or pilot hole 36 in the plate nut. Thereupon the bitI4 is brought into play and. by pressing upon the handle II to therebycompress the spring 24 moving the member 2| inwardly upon the member 20and allowing the bit I4 to move through the Opening 21 to engage thewing 33 of the plate nut and to drill a hole therethrough. Pressure isthen released upon the handle H thus allowing the bit H to be withdrawnfrom the hole thus drilled and from the opening 21. The device is thenturned upon the nut until the detent 29 is forced into the previouslydrilled hole in the wing 33 by the spring 3|, the guide pin meantimebeing. allowed the remain in the pilot hole 36. Again the handle H ispressed and the drilling operation again performed to bore a hole in thewing 34. Obviously th positioning of the detent 29 in the one hole willguide the bit and cause the second hole to be drilled in a, positiondiametrically opposite the first hole. It is also pointed out thatbreakage of drill bits is prevented to a large degree by the fact thatthe plate 25 abuts the plate nut when in operation and, in such osition,causes the drill bit M to be placed only perpendicularly to the work tobe drilled.

While but one form of the invention has been shown and described herein,it will be readily apparent to those skilled in the art that many minormodifications may be made without departing from the spirit of theinvention or the scope of the appended claim.

What is claimed is:

In a device of the character described, the provision of a guide platehaving an integrally formed pair of diametrically opposed ears, acentrally disposed guide pin afilxed to one face or said plate, saidplate having a drill bit-receiving opening in one ear thereof in spacedparallel relation to said pin and centrally disposed with respect to thesides of said ear, and a, spring-pressed detent mounted in said otherear of said plate in a position diametrically corresponding to saiddrill bitreceivin opening in said first-mentioned ear, said detent beingin spaced parallel relation to said guide pin.

BERNARD R. HEIL.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 334,817 Spratley Jan. 26, 1886647,133 Emery Apr. 10, 1900 793,892 Miller et a1 July 4, 1905 1,424,941Perwitz Aug. 8, 1922 1,946,421 Brown Feb. 6, 1934 2,210,128 Rohr Aug. 6.1940 2,372,398 Schoffner Mar. 27, 1945 2,401,490 Little June 4, 19462,430,025 Matthias et a1 Nov. 4, 1947 FOREIGN PATENTS Number CountryDate 356,942 Great Britain .l Sept. 17, 1931

